/***********************************************
* Featured Image Zoomer (w/ adjustable power)- By Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for this script and 100s more
***********************************************/

/*Featured Image Zoomer (May 8th, 2010)
* This notice must stay intact for usage
* Author: Dynamic Drive at http://www.dynamicdrive.com/
* Visit http://www.dynamicdrive.com/ for full source code
*/

// Feb 21st, 2011: Script updated to v1.5, which now includes new feature by jscheuer1 (http://www.dynamicdrive.com/forums/member.php?u=2033) to show optional "magnifying lens" while over thumbnail image.
// March 1st, 2011: Script updated to v1.51. Minor improvements to inner workings of script.

jQuery.noConflict()

jQuery('head').append('<style type="text/css">.featuredimagezoomerhidden {visibility: hidden!important;}</style>');

var featuredimagezoomer={
  loadinggif: 'inc/imagezoom/spinningred.gif', //full path or URL to "loading" gif
  magnifycursor: 'crosshair', //Value for CSS's 'cursor' attribute, added to original image

  /////NO NEED TO EDIT BEYOND HERE////////////////
  dsetting: { //default settings
      magnifierpos: 'right',
      magnifiersize:[200, 200],
      cursorshadecolor: '#fff',
      cursorshadeopacity: 0.3,
      cursorshadeborder: '1px solid black',
      cursorshade: false,
      leftoffset: 15, //offsets here are used (added to) the width of the magnifyarea when
      rightoffset: 10 //calculating space requirements and to position it visa vis any drop shadow
    },
  isie: (function(){/*@cc_on @*//*@if(@_jscript_version >= 5)return true;@end @*/return false;})(), //is this IE?

  showimage: function($, $tracker, $mag, showstatus){
    var specs=$tracker.data('specs'), d=specs.magpos, fiz=this;
    var coords=$tracker.data('specs').coords //get coords of tracker (from upper corner of document)
    specs.windimensions={w:$(window).width(), h:$(window).height()}; //remember window dimensions
    var magcoords={} //object to store coords magnifier DIV should move to
    magcoords.left = coords.left + (d === 'left'? -specs.magsize.w - specs.lo : $tracker.width() + specs.ro);
    //switch sides for magnifiers that don't have enough room to display on the right if there's room on the left:
    if(d!=='left' && magcoords.left + specs.magsize.w + specs.lo >= specs.windimensions.w && coords.left - specs.magsize.w >= specs.lo){
      magcoords.left = coords.left - specs.magsize.w - specs.lo;
    } else if(d==='left' && magcoords.left < specs.ro) { //if there's no room on the left, move to the right
      magcoords.left = coords.left + $tracker.width() + specs.ro;
    }
    $mag.css({left: magcoords.left, top:coords.top}).show(); //position magnifier DIV on page
    specs.$statusdiv.html('Current Zoom: '+specs.curpower+'<div style="font-size:80%">Use Mouse Wheel to Zoom In/Out</div>');
    if (showstatus) //show status DIV? (only when a range of zoom is defined)
      fiz.showstatusdiv(specs, 400, 2000);
  },

  hideimage: function($tracker, $mag, showstatus){
    var specs=$tracker.data('specs');
    $mag.hide();
    if (showstatus)
      this.hidestatusdiv(specs);
  },

  showstatusdiv: function(specs, fadedur, showdur){
    clearTimeout(specs.statustimer)
    specs.$statusdiv.fadeIn(fadedur) //show status div
    specs.statustimer=setTimeout(function(){featuredimagezoomer.hidestatusdiv(specs)}, showdur) //hide status div after delay
  },

  hidestatusdiv: function(specs){
    specs.$statusdiv.stop(true, true).hide()
  },

  getboundary: function(b, val, specs){ //function to set x and y boundaries magnified image can move to (moved outside moveimage for efficiency)
    if (b=="left"){
      var rb=-specs.imagesize.w*specs.curpower+specs.magsize.w
      return (val>0)? 0 : (val<rb)? rb : val
    }
    else{
      var tb=-specs.imagesize.h*specs.curpower+specs.magsize.h
      return (val>0)? 0 : (val<tb)? tb : val
    }
  },

  moveimage: function($tracker, $maginner, $cursorshade, e){
    var specs=$tracker.data('specs'), csw = Math.round(specs.magsize.w/specs.curpower), csh = Math.round(specs.magsize.h/specs.curpower),
    csb = specs.csborder, fiz = this, imgcoords=specs.coords, pagex=(e.pageX || specs.lastpagex), pagey=(e.pageY || specs.lastpagey),
    x=pagex-imgcoords.left, y=pagey-imgcoords.top;
    $cursorshade.css({ // keep shaded area sized and positioned proportionately to area being magnified
      visibility: '',
      width: csw,
      height: csh,
      top: Math.min(specs.imagesize.h-csh-csb, Math.max(0, y-(csb+csh)/2)) + imgcoords.top,
      left: Math.min(specs.imagesize.w-csw-csb, Math.max(0, x-(csb+csw)/2)) + imgcoords.left
    });
    var newx=-x*specs.curpower+specs.magsize.w/2 //calculate x coord to move enlarged image
    var newy=-y*specs.curpower+specs.magsize.h/2
    $maginner.css({left:fiz.getboundary('left', newx, specs), top:fiz.getboundary('top', newy, specs)})
    specs.$statusdiv.css({left:pagex-10, top:pagey+20})
    specs.lastpagex=pagex //cache last pagex value (either e.pageX or lastpagex), as FF1.5 returns undefined for e.pageX for "DOMMouseScroll" event
    specs.lastpagey=pagey
  },

  magnifyimage: function($tracker, e, zoomrange){
    var delta=e.detail? e.detail*(-120) : e.wheelDelta //delta returns +120 when wheel is scrolled up, -120 when scrolled down
    var zoomdir=(delta<=-120)? "out" : "in"
    var specs=$tracker.data('specs')
    var magnifier=specs.magnifier, od=specs.imagesize, power=specs.curpower
    var newpower=(zoomdir=="in")? Math.min(power+1, zoomrange[1]) : Math.max(power-1, zoomrange[0]) //get new power
    var nd=[od.w*newpower, od.h*newpower] //calculate dimensions of new enlarged image within magnifier
    magnifier.$image.css({width:nd[0], height:nd[1]})
    specs.curpower=newpower //set current power to new power after magnification
    specs.$statusdiv.html('Current Zoom: '+specs.curpower)
    this.showstatusdiv(specs, 0, 500)
    $tracker.trigger('mousemove')
  },

  init: function($, $img, options){
    var setting=$.extend({}, this.dsetting, options), w = $img.width(), h = $img.height(), o = $img.offset(),
    fiz = this, $tracker, $cursorshade, $statusdiv, $magnifier, lastpage = {pageX: 0, pageY: 0};
    setting.largeimage = setting.largeimage || $img.get(0).src;
    $magnifier=$('<div class="magnifyarea" style="position:absolute;width:'+setting.magnifiersize[0]+'px;height:'+setting.magnifiersize[1]+'px;left:-10000px;top:-10000px;visibility:hidden;overflow:hidden;border:1px solid black;" />')
      .append('<div style="position:relative;left:0;top:0;" />')
      .appendTo(document.body) //create magnifier container
    //following lines - create featured image zoomer divs, and absolutely positioned them for placement over the thumbnail and each other:
    if(setting.cursorshade){
      $cursorshade = $('<div class="cursorshade" style="visibility:hidden;position:absolute;left:0;top:0;" />')
        .css({border: setting.cursorshadeborder, opacity: setting.cursorshadeopacity, backgroundColor: setting.cursorshadecolor})
        .appendTo(document.body);
    } else {
      $cursorshade = $('<div />'); //dummy shade div to satisfy $tracker.data('specs')
    }
    $statusdiv = $('<div class="zoomstatus preloadevt" style="position:absolute;visibility:hidden;left:0;top:0;" />')
      .html('<img src="'+this.loadinggif+'" />')
      .appendTo(document.body); //create DIV to show "loading" gif/ "Current Zoom" info
    $tracker = $('<div class="zoomtracker" style="cursor:progress;position:absolute;left:'+o.left+'px;top:'+o.top+'px;height:'+h+'px;width:'+w+'px;" />')
      .css({backgroundImage: (this.isie? 'url(cannotbe)' : 'none')})
      .appendTo(document.body);
    $(window).resize(function(){ //in case resizing the window repostions the image
        var o = $img.offset();
        $tracker.css({left: o.left, top: o.top});
      });

    function getspecs($maginner, $bigimage){ //get specs function
      var magsize={w:$magnifier.width(), h:$magnifier.height()}
      var imagesize={w:w, h:h}
      var power=(setting.zoomrange)? setting.zoomrange[0] : ($bigimage.width()/w).toFixed(5)
      $tracker.data('specs', {
        $statusdiv: $statusdiv,
        statustimer: null,
        magnifier: {$outer:$magnifier, $inner:$maginner, $image:$bigimage},
        magsize: magsize,
        magpos: setting.magnifierpos,
        imagesize: imagesize,
        curpower: power,
        coords: getcoords(),
        csborder: $cursorshade.outerWidth(),
        lo: setting.leftoffset,
        ro: setting.rightoffset
      })
    }

    function getcoords(){ //get coords of thumb image function
      var offset=$tracker.offset() //get image's tracker div's offset from document
      return {left:offset.left, top:offset.top}
    }

    $tracker.mouseover(function(e){
          $cursorshade.add($magnifier).add($statusdiv).removeClass('featuredimagezoomerhidden');
          $tracker.data('premouseout', false);
      }).mouseout(function(e){
          $cursorshade.add($magnifier).add($statusdiv.not('.preloadevt')).addClass('featuredimagezoomerhidden');
          $tracker.data('premouseout', true);
      }).mousemove(function(e){ //save tracker mouse position for initial magnifier appearance, if needed
        lastpage.pageX = e.pageX;
        lastpage.pageY = e.pageY;
      });

    $tracker.one('mouseover', function(e){
      var $maginner=$magnifier.find('div:eq(0)')
      var $bigimage=$('<img src="'+setting.largeimage+'"/>').appendTo($maginner)
      var showstatus=setting.zoomrange && setting.zoomrange[1]>setting.zoomrange[0]
      $img.css({opacity:0.1}) //"dim" image while large image is loading
      var imgcoords=getcoords()
      $statusdiv.css({left:imgcoords.left+w/2-$statusdiv.width()/2, top:imgcoords.top+h/2-$statusdiv.height()/2, visibility:'visible'})
      $bigimage.bind('loadevt', function(){ //magnified image ONLOAD event function (to be triggered later)
        $img.css({opacity:1}) //restore thumb image opacity
        $statusdiv.empty().css({border:'1px solid black', background:'#C0C0C0', padding:'4px', font:'bold 13px Arial', opacity:0.8}).hide().removeClass('preloadevt');
        if($tracker.data('premouseout')){
          $statusdiv.addClass('featuredimagezoomerhidden');
      	}
        if (setting.zoomrange){ //if set large image to a specific power
          var nd=[w*setting.zoomrange[0], h*setting.zoomrange[0]] //calculate dimensions of new enlarged image
          $bigimage.css({width:nd[0], height:nd[1]})
      	}
        getspecs($maginner, $bigimage) //remember various info about thumbnail and magnifier
        $magnifier.css({display:'none', visibility:'visible'})
        $tracker.mouseover(function(e){ //image onmouseover
          $tracker.data('specs').coords=getcoords() //refresh image coords (from upper left edge of document)
          fiz.showimage($, $tracker, $magnifier, showstatus)
      	})
        $tracker.mousemove(function(e){ //image onmousemove
          fiz.moveimage($tracker, $maginner, $cursorshade, e)
      	})
        if (!$tracker.data('premouseout')){
          fiz.showimage($, $tracker, $magnifier, showstatus);
          fiz.moveimage($tracker, $maginner, $cursorshade, lastpage);
      	}
        $tracker.mouseout(function(e){ //image onmouseout
          fiz.hideimage($tracker, $magnifier, showstatus)
        }).css({cursor: fiz.magnifycursor});
        if (setting.zoomrange && setting.zoomrange[1]>setting.zoomrange[0]){ //if zoom range enabled
          $tracker.bind('DOMMouseScroll mousewheel', function(e){
            fiz.magnifyimage($tracker, e, setting.zoomrange);
            e.preventDefault();
        	});
      	}
      })  //end $bigimage onload
      if ($bigimage.get(0).complete){ //if image has already loaded (account for IE, Opera not firing onload event if so)
        $bigimage.trigger('loadevt')
    	}
      else{
        $bigimage.bind('load', function(){$bigimage.trigger('loadevt')})
    	}
    })
  },

  iname: (function(){var itag = jQuery('<img />'), iname = itag.get(0).tagName; itag.remove(); return iname;})()
};

jQuery.fn.addimagezoom=function(options){
  var $=jQuery;
  return this.each(function(){ //return jQuery obj
    if (this.tagName !== featuredimagezoomer.iname)
      return true; //skip to next matched element
    featuredimagezoomer.init($, $(this), options);
  });
}